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Crossword solution:

13 clues for "SIS":

  1. "___ Boom Bah"
  2. Sibling for short
  3. Bro's sibling
  4. Family member
  5. Family nickname.
  6. Girl's nickname.
  7. Little girl's nickname
  8. Little lady
  9. Relative, for short.
  10. "Boom-bah" lead-in
  11. Fam. member
  12. Girl in the family.
  13. Noun suffix